Furnace



3 Sheets \IHITIII! \4 FURNACE J. J. ENGLISH Filed May 13 June 30, 1925.

' ATTORNEYS June 30, 1925.

J. J. ENGLISH FURNACE Filed May 13, 1922 3 Sheets-Sheet 2 INVENTORATTORNEYS- Patented June 30, 1925.

UNITED- sT- JOHN J. ENGLISH,-

or new YORK, N; Y. Y

' FURNACE.

Application filed May 13,-

To all whom it may concern:

Be it known that I, JoHN- J'. ENGLISH, a citizen of the United States,and resident of the borough of Manhattan, in the city and State of NewYork, have invented anew and useful Improvement in Furnaces, ofwhich'the following is 'a specification.

Infurnaces of usual construction, the temperature reachedby the firesides of furnace walls is so high that the fire bricks become soft and asmall film of liquefied brick is present on the face nearest the fire.Ash, which is always present in the fuel bed, also fuses at thistemperature and whenever this fuse ash or clinker comes in contact withthe molten brick surfaces, a weldtakes place. Once this weld hasstarted, it spreads rapidly, the layer thickens and a rapiddeterioration of the fire bricks take'spla'ce- As this. lay-er ofclinker thickens, it chokes the fire and in thecase of stoker furnaces,presents a danger of stoker destruction. Furthermore, the burningthrough ofthe Walls in many instances brings about the collapse of thewalls with 'the possibility of serious as well as costly damage. This.formation of clinker necessitates frequent removal to prevent it frombecoming a menace. To remove the clinker, the fire must be burned downand the coal on the grate is wasted. There is consequently a serviceloss, the loss of investment, the cost of labor. for removing theclinker" and the strain on the furnace side walls,,because of the shocksfromthe sledge hammers used in removing the clinker. Also the coolingofthe walls requires more coal to bring them back to=normal temperatureand the contraction and expansion, due to this frequent cooling andheating, injures the walls.-

This clinker forms at certain critical points onthe side walls where thefuel bed temperature is high and clinker abundance at a maximum.

My invention provides means for preventing this clinker formation, bythe introduction of rotary side wall members at the critical points,whereby the constant changing ofthe side wall surfaces at these pointseliminates entirely the formation of clinkers, thus materiallyincreasing'the efficiency of the furnace.

My invention is particularly well adapted for use in connection withstoker furnaces, therefore I have represented my invention 1922.- SerialN0. 560,650.

as applied to an underfeedstoker furnaceof usual type.

Practical embodiments of my invention are represented in theaccompanying drawings, in which a Fig. 1 represents a detaillongitudinal vertical section through the furnace,- taken in the planeof the line-1&1, of Fig. 3, looking in the'direction of the arrows;certain of the parts being shown in full lines and certain of thepartsin dotted lines. Fig. 2 represents a similar detail section, taken inthe plane of the line IIII of Fig. 3 represents a detail transversevertical section taken in the plane of the line IIIIII, of Fig. 1,looking in the direction of the arrows. i

Fig. 4; represents a back view of one form of a side wall membersection.h

Fig. 5 represents an'inverted end view of the same. 7 1

Fig. 6 represents a face view showing the same perforated.

Fig. 7 represents a back view of another form of side wall membersection.

Fig. 8 represents an inverted end view of the same. V

F ig. 9 represents a face view showing-the SHIHQPGI'fQl'HtGClQ I V Fig.10 represents a detail section show-' ing the means for securing thesections to their Wheeh r The fixed side walls. of the furnace aredenoted by 1, 1, and the grate by 2. The fuel hopper is denoted by 3,the fuel feeding plunger by {l and the shaft of the fuel feedingmeans by5. It willbe understood that all of these'parts are of well knownconstruction. p f i H Recesses' 6,6 are formedin the fixed'side walls'1, l-of the furnace at the points where thereis a tendency forthe-clinkers to form. These recesses extend above and below thegrate'level, the tops of the recesses being ofsemicircular arched-form.Wheels 7, 7 are located within the recesses 6, (Sand-are carriedby stubshafts 8, Srotzltably mounted in theside walls of the furnace below thegrate level. The side wall members are removably secured to the wheels 77 with their fire faces" substantially flush with the fire faces ofthe'fiXed'side walls1,-1, so as to forina continuation of-the said'firewalls above the grate level. These side wall mem' 11.0

here are preferably composed of annular series ofsectlons separatelysecured to their respective wheels 7, 7 for purposes of resage of airtherethrough. 1 s 7 The inner peripheral edges of the sections 9 areprovidedwith lips'lO seated in the hub placement and renewal.

' These side wall member sections 9, shown .in Figs. lto 6 inclusive areof metal construction, while the sections 9* shown in Figs. 7 to 10inclusive are of fire brick construction. These sections may beperforated as shownm Figs. 6 and 9 to permlt the pas- 11? of" the wheel7, the outer peripheries of these sections 9* being removably secured tothe peripheral rim ll of the wheel 7, by

2 suitable. fastening devices, such as bolts 15.

In both instances it is to be understood that these annular series ofsections form a continuous wall member.

The means which Iihave shown for 'driv-' ing the rotary wheels 7 'Z andtheir side wall members from "the fuel feeding mechanism shaft 5,"isconstructed, arranged and operated as follows r A cross shaft'lfi'mounted at its ends in hangers 17 1'( is providedwith spur gears 18, 18meshing'with pinions 19, 19 on the inner endsof'thezstub shafts 8, 8.This cross shaft 16 is provided with ratchets. 20,

I 20, engaged by pawls21, 21, carried by arms 22, 22,'loosely mounted onthe'cross shaft 16', which arms are attached to the ends 23, 23, ofconnecting rods 24, 24, the opposite ends of which rods are pivoted at25, 25 to crank arms 26, 26 on the fuel feeding mechanism shaft 5.Therefore, the rotary .movement of the shaft 5 will impart anintermittent rotary 'IHOVBIIIfiHl'ftO the wheels 7, 7

- and their side wall members.

The driving connection-is intended to be so proportloned as to give therequired .speed of rotation to the rotary side wall members, to ensurethe best results.

..-From the above description it will be seen that air is permitted tocirculate in the recesses 6, 6 of the side walls 1, 1 back of the rotaryside wall members. It will also be seen that the provision of sectionalrotary side wall members permits the renewal and interchanging of thesaid sections as required, said "renewals being I accomplished when thesections are located in the air space below the grate level.

The circulation behind the rotary side wall members accomplishes to agreat degree the decrease of radiation lossand keeps the fire surfaceswell below fusing point.

Furthermore, as only certain portions of these rotating side wallmembersare exposed to furnace temperature at any one time, excessive heating ofthese portions is prevented. No portions of the rotary side wall membersare above the grate level sufficiently long to become excessivelyheated,

the portions below the grate level being cooled by air circulation.Therefore, cool port-ions of the side wall members are continuallyreplacing the more heated. ones. Vhere adraft space occupies the entire'space beneath the grate level, all benefits derived from air circulationare greatly increased and all heat absorbed by the'portions ofth'erotaryside wall members which has come from above the grate level isreturned, the air which cools them absorbing the heat which isan'aid tocombustion for which the air is used. r

'By mounting the rotary side wall mew bers so that their surfaces maybesubstantially flush with the fixed sidewalls, the movement of the sidewall members serves to slice the fuel bed, breaking it up and ad mittingmore air atthese points. Thus the fire becomes cleaner and the tendencyto the formation of clinkers greatly decreases, re-' 7 sulting in thetendency ofthe clean fire to burn off any clinker aproaohingthe'wall.

It will also be noted that a space below ible for inspection, renewal,etc.

Vvhile I have disclosed only one of these 1 rotary side wall members ineach side wall the grateis provided which is easily access of thefurnace, it is obvious that any number of these members may be insertedthat may be necessary;

l/V'hile I have particularly shown and explained this invention asapplied to the side walls of a furnace,it is obvious that it be appliedwherever desired. I

It is also evident that various changes may be resorted to in theconstruction, form and arrangement of the several parts withoutdeparting from the spirit and scope of my invention; hence I do not wishto be limited to the particular embodiments herein shown and described,but

'lVhat I claim is '1. Ina furnace, a grate, vertically disposed fixedwalls, wall members having their fire faces substantially flush withsaid fixed walls, andmeans foractuating the wall members'to bringdifferent parts of the fire face of each successively-into and out ofoperative relations with respect to the grate. f 2. In a furnace, agrate, vertically disposed'fixed walls, wall members extending above andbelow the grate level, said wall members having their fire facessubstantially flush with said fixed walls, and means for actuatingthewall members to'bring differ out parts of the fire face of eachsuccessively 10.5 i may into and out of operative relations with respectto the grate.

3. In a furnace, a grate, vertically disposed fixed walls, sectionalwall members having their fire faces substantially flush with said fixedwalls, and means for actuating the wall members to bring difierent partsof the fire face of each successively into and out of operativerelations with respect to the grate.

4. In a furnace, a grate, vertically disposed fixed walls, sectionalwall members extending above and below the grate level, said wallmembers having their fire faces substantially flush with said fixedwalls, and means for actuating thewall members to bring different partsof the fire face of each successively into and out of operativerelations with respect to the grate.

5. In a furnace, a grate, vertically disposed fixed walls, rotatablewall members having their fire faces sucstantially flush with said fixedwalls, and means for rotating said wall'members, to bring differentparts of the fire face of each successively into and out of operativerelations with respect to the grate.

6. In a furnace, a grate, vertically disposed fixed walls, rotatablewall members provided with series of removable sections, the fire facesof said sections being substantially flush with said fixed walls, andmeans for rotating the wall members to bring different parts of the fireface of each successively into and out of operative relations withrespect to the grate.

7. In a furnace, a grate, vertically disposed fixed walls, rotatablewall members provided with series of removable perforated sections, thefire faces of said sections being substantially flush with said fixedwalls, and means for rotating the wall members to bring different partsof the fire face of each successively into and out of operativerelations with respect to the grate.

8. In a furnace, fixed walls, movable sectional wall members extendingabove and below the grate level, and means for rotat ing said members tobring successive sections above and below the grate level.

9. In a furnaceffixed walls having recesses, wheels located in saidrecesses, wall members carried by said wheels and forming continuationsof said fixed walls, and

successive sections of the wall members above and below the grate level.

11. In a furnace, a grate, fuel feeding means, vertically disposed fixedwalls, and rotatable wall members driven from said fuel feeding means,to change the relations of the parts of the fire face of each memberwith respect to the grate.

12. In a furnace, a grate, fuel feeding means, vertically disposed fixedwalls, and rotatable wall members extending above and below the gratelevel anddriven from said fuel feeding means, to change the relations ofthe parts of the fire face of each member with respect to the grate.

In testimony, that I claim the foregoing as my invention, I have signedmy name this 1st day of May 1922. 7

JOHN J. ENGLISH.

